III. REPORT ON A COLLECTION OF 



AQUATIC ANIMALS MADE IN TIBET 



BY CAPTAIN F. H. STEWART. I. M.S., 



DURING THE YEAR 1907. 



Part II.— Ougoch^te Worms, Moixttsca and 

 Fish [Geographical). 



REPORT ON A COLLECTION OF THE SMALLER 



OLIOOCH^.TA MADE BY CAPT. F. H. vSTEWART, 



I.M.S., IN TIBET. 



Bv J. Stephenson, Major ^ I. M.S., Professor of Biology^ 

 Government College, Lahore. 



(Plate viii.) 



The collection of the smaller Oligochaeta, made by Capt. 

 F. H. Stewart, I. M.S., in Tibet during the year 1907, consisted 

 of fourteen tubes, with the contents of which the following report 

 deals. 



The specimens were on the whole in a good state of preserva- 

 tion, but the free ends of the setse of many specimens had suffered 

 severely, and a number of the animals also had apparently been 

 fixed with a brown staining substance, which hindered subsequent 

 staining and seemed to interfere with the section-cutting process. 



The contents of two of the tubes were unfortunately incapable 

 of recognition : — 



No. 68 (Mang-tsa, Tibet ; 14,500 ft. ; July 1907) contained a 

 considerable number of specimens. These were the largest 

 animals submitted to me ; they measured up to 35 mm. ; the seg- 

 ments numbered up to 175. They were all, however, sexually 

 immature, and I was unable to distinguish either clitellum or 

 genital organs ; possibly this was a young brood of some earthworm 

 i.e., of one of the larger Oligochaeta. 



No. 80 (Mang-tsa, Tibet ; 14,500 ft. ; i2-viii-07) contained 

 three specimens, and sections show that they belong to the 

 Tubificidae ; but the setae had, in this instance, suffered so severelv 

 that I was unable, in any of the specimens, to discover a single 

 sound one in either dorsal or ventral bundles ; further discrimina- 

 tion is therefore impossible. 



The contents of the remaining twelve tubes comprised only 

 five distinct s])ecies, owing to the large number (seven) which 

 contained the form described below as Limnodrilus sp. (?). 



